Pub Date : 2025-06-19DOI: 10.1016/j.colsuc.2025.100073
C.E.D. Cardoso , J.C. Almeida , J. Rocha , E. Pereira
Phosphate, a critical resource essential for agriculture and industry, faces a rising demand that outpaces population growth. The European Union's classification of phosphate as a critical raw material since 2011 highlights its significance and the region's dependence on imports. To address this challenge, our study aims to enhance phosphorus recovery from real industrial effluents utilizing cobalt ferrite nanoparticles. We employed the design of experiments along with response surface methodology to optimize the phosphorus recovery process and identify the most influential factors. The optimal conditions for achieving over 80 % phosphorus recovery from a 25 mg P/L solution were found to be either a sorbent dose of 3.5 g/L with a 15-minute contact time or a 2.5 g/L dose with 1 h if exposure, both at pH 6 and 60 ºC. Additionally, this study demonstrates that reusing nanoparticles in multiple 15-minute sorption cycles yielded higher phosphorus recovery compared to a continuous 1-hour cycle. This approach offers an effective and eco-friendly way to recover phosphorus from pulp mill effluents, reducing environmental impact and providing a valuable resource for the future, thereby contributing to the circular economy of phosphorus.
{"title":"Optimizing phosphorus recovery from an acidic pulp stream with cobalt ferrite nanoparticles: A methodology for pulp mills","authors":"C.E.D. Cardoso , J.C. Almeida , J. Rocha , E. Pereira","doi":"10.1016/j.colsuc.2025.100073","DOIUrl":"10.1016/j.colsuc.2025.100073","url":null,"abstract":"<div><div>Phosphate, a critical resource essential for agriculture and industry, faces a rising demand that outpaces population growth. The European Union's classification of phosphate as a critical raw material since 2011 highlights its significance and the region's dependence on imports. To address this challenge, our study aims to enhance phosphorus recovery from real industrial effluents utilizing cobalt ferrite nanoparticles. We employed the design of experiments along with response surface methodology to optimize the phosphorus recovery process and identify the most influential factors. The optimal conditions for achieving over 80 % phosphorus recovery from a 25 mg P/L solution were found to be either a sorbent dose of 3.5 g/L with a 15-minute contact time or a 2.5 g/L dose with 1 h if exposure, both at pH 6 and 60 ºC. Additionally, this study demonstrates that reusing nanoparticles in multiple 15-minute sorption cycles yielded higher phosphorus recovery compared to a continuous 1-hour cycle. This approach offers an effective and eco-friendly way to recover phosphorus from pulp mill effluents, reducing environmental impact and providing a valuable resource for the future, thereby contributing to the circular economy of phosphorus.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100073"},"PeriodicalIF":0.0,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The search for ceramic materials with chemical stability, mechanical resistance, and high adsorption capacity has led to the proposal of several structural modifications, such as combining two oxides in a single material, and surface modifications, such as incorporating metallic nanoparticles upon the surface of a ceramic material. This study presents the synthesis, characterization, and adsorption capacity of ciprofloxacin of porous spherical composites of Al₂O₃, Al₂O₃-CeO₂ and Al₂O₃-CeO₂-Ag. Polystyrene (PS) nanospheres were employed as a sacrificial template to enhance porosity, and silver nanoparticles (Ag-Nps) were used for surface decoration. The phase transformations of Al₂O₃ and CeO₂ into their stable crystalline forms were confirmed through FTIR and XRD analysis. Scanning electron microscopy (SEM) revealed a homogeneous polycrystalline morphology, while zeta potential (pζ) analysis indicated an increase in negative surface charge, reaching values of −87 mV for Ag-decorated spheres at pH 5. Adsorption studies demonstrated ciprofloxacin removal capacities of 0.25 mg g⁻¹ for Al₂O₃, 1.02 mg g⁻¹ for Al₂O₃-CeO₂ and 0.39 mg g⁻¹ for Al₂O₃-CeO₂-Ag at pH 5. Kinetic analyses fit well to pseudo-second-order and Elovich models, with determination coefficients ranging from 0.89 to 0.99, due to a mixed chemisorption mechanism. Freundlich and Temkin models confirmed the affinity of the three materials for ciprofloxacin, with Freundlich coefficients exceeding 1.0 and Temkin adsorption heats exceeding 26,000 J mol−1, findings that highlight the potential of Al₂O₃, Al₂O₃-CeO₂ and Al₂O₃-CeO₂-Ag as efficient adsorbent materials for pharmaceutical contaminants, like ciprofloxacin, in water treatment applications.
{"title":"Ag-decorated Al2O3-CeO2 spherical composite as an efficient adsorbent for removal of ciprofloxacin in aqueous media","authors":"Lorenzo Iván Salamanca-Córdoba , Pamela Nair Silva-Holguín , Félix Antonio Naranjo-Castañeda , Erasto Armando Zaragoza-Contreras , Refugio Rodríguez-Vázquez , Simón Yobanny Reyes-López","doi":"10.1016/j.colsuc.2025.100072","DOIUrl":"10.1016/j.colsuc.2025.100072","url":null,"abstract":"<div><div>The search for ceramic materials with chemical stability, mechanical resistance, and high adsorption capacity has led to the proposal of several structural modifications, such as combining two oxides in a single material, and surface modifications, such as incorporating metallic nanoparticles upon the surface of a ceramic material. This study presents the synthesis, characterization, and adsorption capacity of ciprofloxacin of porous spherical composites of Al₂O₃, Al₂O₃-CeO₂ and Al₂O₃-CeO₂-Ag. Polystyrene (PS) nanospheres were employed as a sacrificial template to enhance porosity, and silver nanoparticles (Ag-Nps) were used for surface decoration. The phase transformations of Al₂O₃ and CeO₂ into their stable crystalline forms were confirmed through FTIR and XRD analysis. Scanning electron microscopy (SEM) revealed a homogeneous polycrystalline morphology, while zeta potential (pζ) analysis indicated an increase in negative surface charge, reaching values of −87 mV for Ag-decorated spheres at pH 5. Adsorption studies demonstrated ciprofloxacin removal capacities of 0.25 mg g⁻¹ for Al₂O₃, 1.02 mg g⁻¹ for Al₂O₃-CeO₂ and 0.39 mg g⁻¹ for Al₂O₃-CeO₂-Ag at pH 5. Kinetic analyses fit well to pseudo-second-order and Elovich models, with determination coefficients ranging from 0.89 to 0.99, due to a mixed chemisorption mechanism. Freundlich and Temkin models confirmed the affinity of the three materials for ciprofloxacin, with Freundlich coefficients exceeding 1.0 and Temkin adsorption heats exceeding 26,000 J mol<sup>−1</sup>, findings that highlight the potential of Al₂O₃, Al₂O₃-CeO₂ and Al₂O₃-CeO₂-Ag as efficient adsorbent materials for pharmaceutical contaminants, like ciprofloxacin, in water treatment applications.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100072"},"PeriodicalIF":0.0,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-12DOI: 10.1016/j.colsuc.2025.100071
Linglong Li , Yonggang Zhang
In this paper, reduced graphene oxide-modified nickel foam (rGO/NF) was utilised as an activator for peroxymonosulfate (PMS) in the electrocatalytic oxidation reaction and combined with a coagulation process to form the combined system of E-rGO/NF-PMS and coagulation in order to improve the pollutant degradation efficiency and shorten the reaction residence time. Various analytical methods were employed to characterise the electrode materials and the formed flocs in detail, and the effects of key parameters, such as applied voltage, PMS dosage, pH, and coagulant dosage, on the whole system were investigated by orthogonal experimental design. The results showed that the coagulation performance of the wastewater was enhanced by the electrocatalytic oxidation treatment, and tetracycline hydrochloride was effectively degraded by the addition of coagulant through adsorption of electro-neutralisation and net trapping and sweeping, and the concentration and chemical oxygen demand (COD) removal were 97.19 % and 91.97 %, respectively. In addition, the intermediate products generated from the degradation of pollutants were analysed in depth by using electron spin resonance (ESR), liquid chromatography-mass spectrometry (LC-MS), Fourier transform infrared spectroscopy (FTIR) and other techniques, focusing on the mechanism of action and degradation pathway of the combined coagulation process of electrocatalysis. In conclusion, the combined system of E-rGO/NF-PMS and coagulation overcame the shortcomings of long electrocatalytic oxidation time and coagulation time, and poor COD treatment effect, and provided new ideas and technical references for the future practical wastewater treatment engineering.
{"title":"rGO/NF as anode electrocatalytically activates persulfate combined coagulation process for tetracycline hydrochloride wastewater removal","authors":"Linglong Li , Yonggang Zhang","doi":"10.1016/j.colsuc.2025.100071","DOIUrl":"10.1016/j.colsuc.2025.100071","url":null,"abstract":"<div><div>In this paper, reduced graphene oxide-modified nickel foam (rGO/NF) was utilised as an activator for peroxymonosulfate (PMS) in the electrocatalytic oxidation reaction and combined with a coagulation process to form the combined system of E-rGO/NF-PMS and coagulation in order to improve the pollutant degradation efficiency and shorten the reaction residence time. Various analytical methods were employed to characterise the electrode materials and the formed flocs in detail, and the effects of key parameters, such as applied voltage, PMS dosage, pH, and coagulant dosage, on the whole system were investigated by orthogonal experimental design. The results showed that the coagulation performance of the wastewater was enhanced by the electrocatalytic oxidation treatment, and tetracycline hydrochloride was effectively degraded by the addition of coagulant through adsorption of electro-neutralisation and net trapping and sweeping, and the concentration and chemical oxygen demand (COD) removal were 97.19 % and 91.97 %, respectively. In addition, the intermediate products generated from the degradation of pollutants were analysed in depth by using electron spin resonance (ESR), liquid chromatography-mass spectrometry (LC-MS), Fourier transform infrared spectroscopy (FTIR) and other techniques, focusing on the mechanism of action and degradation pathway of the combined coagulation process of electrocatalysis. In conclusion, the combined system of E-rGO/NF-PMS and coagulation overcame the shortcomings of long electrocatalytic oxidation time and coagulation time, and poor COD treatment effect, and provided new ideas and technical references for the future practical wastewater treatment engineering.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100071"},"PeriodicalIF":0.0,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We report the successful solvothermal synthesis of Iron-Nickel bimetallic MOFs (F:N@BTC) as a heterogeneous catalyst without high-temperature annealing. F:N@BTC demonstrated superior catalytic activity in the removal of Organic Contaminants (OCs) attributed to the synergistic effects of two metals (Fe-Ni), high specific surface area (673 m2 g−1), and mesoporous structure. The negatively charged surface of F:N@BTC (zeta potential ∼-30 mV) enhances adsorption, particularly for the cationic OCs. The adsorption capacity (qe, mg g−1) of F:N@BTC for OCs follows the order: Toluidine Blue (TB, 962) > Rhodamine B (RB, 842) > Ciprofloxacin (CF, 808) > Nalidixic acid (NA, 616) > Rose Bengal (RoB, 595) within 2 hours without using reducing agent. This result indicates the order of higher adsorption capacity towards cationic to anionic surface charge of the OCs. Comparative studies confirm F:N@BTC’s superiority over monometallic analogs (F@BTC, N@BTC). Kinetic analysis reveals the adsorption of OCs on F:N@BTC followed pseudo-second-order kinetics indicating chemisorption with intraparticle diffusion contributing co-operatively. This work highlights the potential of F:N@BTC MOFs as an efficient adsorbent for the wastewater treatment across diverse Organic Contaminants.
{"title":"Bimetallic MOFs for the effective removal of organic contaminants: Dyes and antibiotics","authors":"Pamthingla Ragui , Anita Yadav , Shalu Goyal , Swati Rani , Vijay Kumar Goel , Rakesh Kumar Sharma","doi":"10.1016/j.colsuc.2025.100070","DOIUrl":"10.1016/j.colsuc.2025.100070","url":null,"abstract":"<div><div>We report the successful solvothermal synthesis of Iron-Nickel bimetallic MOFs (F:N@BTC) as a heterogeneous catalyst without high-temperature annealing. F:N@BTC demonstrated superior catalytic activity in the removal of Organic Contaminants (OCs) attributed to the synergistic effects of two metals (Fe-Ni), high specific surface area (673 m<sup>2</sup> g<sup>−1</sup>), and mesoporous structure. The negatively charged surface of F:N@BTC (zeta potential ∼-30 mV) enhances adsorption, particularly for the cationic OCs. The adsorption capacity (q<sub>e</sub>, mg g<sup>−1</sup>) of F:N@BTC for OCs follows the order: Toluidine Blue (TB, 962) > Rhodamine B (RB, 842) > Ciprofloxacin (CF, 808) > Nalidixic acid (NA, 616) > Rose Bengal (RoB, 595) within 2 hours without using reducing agent. This result indicates the order of higher adsorption capacity towards cationic to anionic surface charge of the OCs. Comparative studies confirm F:N@BTC’s superiority over monometallic analogs (F@BTC, N@BTC). Kinetic analysis reveals the adsorption of OCs on F:N@BTC followed pseudo-second-order kinetics indicating chemisorption with intraparticle diffusion contributing co-operatively. This work highlights the potential of F:N@BTC MOFs as an efficient adsorbent for the wastewater treatment across diverse Organic Contaminants.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100070"},"PeriodicalIF":0.0,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-10DOI: 10.1016/j.colsuc.2025.100069
Shengchao Wei , Alexander J. Cunliffe , James Redfern , Hailing Guo , Lubomira Tosheva
Thin-film composite (TFC) nanofiltration membranes are widely used for water treatment due to their energy efficiency and high salt rejection, however they are highly susceptible to biological fouling. CHA zeolite with pompom-like morphology was prepared from an organic structure-directing template-free synthesis gel in the presence of sodium and cesium. The zeolite was added to the polyamide (PA) layer of TFC membranes prepared via interfacial polymerization. M-0.01 and M-0.05 TFC membranes prepared with addition of 0.01 wt% and 0.05 wt% CHA zeolite to the aqueous piperazine monomer solution, displayed a thinner PA layer and higher permeability compared to zeolite-free M-0 membranes. The rejection of 2000 ppm Na2SO4 and MgSO4 solutions of the M-0.05 membrane was slightly reduced compared to M-0 and M-0.01 but nevertheless remained higher than 90%. Ag-CHA zeolite suspensions showed antibacterial activity against Escherichia coli, whereas CHA zeolite was inactive. Following bacterial exposure, M-0 control membranes exhibited bacterial growth after 24 h compared to the 0 h count, which was not observed for M-0.05 membranes, where there was no significant difference in the count between 0 h and 24 h. As a bacterial population reduction was not observed in either case, these materials are considered not to be antimicrobial. No bacteria survived on the surface of Ag-treated M-0 and M-0.05 membranes, demonstrating antimicrobial activity. The methodology described in this work could be used to increase the resistance of TFC membranes to biological fouling and increase their operational lifetime.
{"title":"Nanofiltration membranes containing CHA zeolite with pompom-like morphology","authors":"Shengchao Wei , Alexander J. Cunliffe , James Redfern , Hailing Guo , Lubomira Tosheva","doi":"10.1016/j.colsuc.2025.100069","DOIUrl":"10.1016/j.colsuc.2025.100069","url":null,"abstract":"<div><div>Thin-film composite (TFC) nanofiltration membranes are widely used for water treatment due to their energy efficiency and high salt rejection, however they are highly susceptible to biological fouling. CHA zeolite with pompom-like morphology was prepared from an organic structure-directing template-free synthesis gel in the presence of sodium and cesium. The zeolite was added to the polyamide (PA) layer of TFC membranes prepared via interfacial polymerization. M-0.01 and M-0.05 TFC membranes prepared with addition of 0.01 wt% and 0.05 wt% CHA zeolite to the aqueous piperazine monomer solution, displayed a thinner PA layer and higher permeability compared to zeolite-free M-0 membranes. The rejection of 2000 ppm Na<sub>2</sub>SO<sub>4</sub> and MgSO<sub>4</sub> solutions of the M-0.05 membrane was slightly reduced compared to M-0 and M-0.01 but nevertheless remained higher than 90%. Ag-CHA zeolite suspensions showed antibacterial activity against <em>Escherichia coli</em>, whereas CHA zeolite was inactive. Following bacterial exposure, M-0 control membranes exhibited bacterial growth after 24 h compared to the 0 h count, which was not observed for M-0.05 membranes, where there was no significant difference in the count between 0 h and 24 h. As a bacterial population reduction was not observed in either case, these materials are considered not to be antimicrobial. No bacteria survived on the surface of Ag-treated M-0 and M-0.05 membranes, demonstrating antimicrobial activity. The methodology described in this work could be used to increase the resistance of TFC membranes to biological fouling and increase their operational lifetime.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100069"},"PeriodicalIF":0.0,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-07DOI: 10.1016/j.colsuc.2025.100068
Shan Chen , Yuanzhao Ding
Microorganisms have a significant impact on human life, with harmful microorganisms causing diseases such as lung infections and urinary tract infections, while beneficial ones are used for applications like pollutant removal and microbial fuel cell energy generation. A deep understanding of microorganisms is essential for advancing scientific knowledge. Recent research on microorganisms is crucial, and traditional methods such as VOSviewer have been commonly used for bibliometric analysis. In this study, a novel approach is applied to analyze 38,470 articles, providing far more comprehensive information than VOSviewer. The results successfully visualize and identify the latest research findings on microorganisms, while also highlighting the promising future direction of integrating big data and machine learning into microbiology. This innovative approach offers significant potential to accelerate progress in the field, enabling more efficient and accurate microbial research applications.
{"title":"Microorganism research advances from a novel bibliometric method","authors":"Shan Chen , Yuanzhao Ding","doi":"10.1016/j.colsuc.2025.100068","DOIUrl":"10.1016/j.colsuc.2025.100068","url":null,"abstract":"<div><div>Microorganisms have a significant impact on human life, with harmful microorganisms causing diseases such as lung infections and urinary tract infections, while beneficial ones are used for applications like pollutant removal and microbial fuel cell energy generation. A deep understanding of microorganisms is essential for advancing scientific knowledge. Recent research on microorganisms is crucial, and traditional methods such as VOSviewer have been commonly used for bibliometric analysis. In this study, a novel approach is applied to analyze 38,470 articles, providing far more comprehensive information than VOSviewer. The results successfully visualize and identify the latest research findings on microorganisms, while also highlighting the promising future direction of integrating big data and machine learning into microbiology. This innovative approach offers significant potential to accelerate progress in the field, enabling more efficient and accurate microbial research applications.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100068"},"PeriodicalIF":0.0,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Increasing the use and release of titanium dioxide nanoparticles (TiO2 NPs) into aquatic systems, including water compartments used to produce drinking water, represent a risk for human health through direct NPs ingestion. Since drinking water treatment plants (DWTPs) must provide and guarantee the quality of the water for human consumption, in this study, TiO2 NPs removal efficiency of a DWTP which provides drinking water for half million consumers is investigated. For that purpose, a pilot-scale designed to closely reproduce each treatment process of the main DWTP is considered. Experiments were first conducted without considering the coagulation process to evaluate the efficiency of the filtration processes (sand and granular activated carbon) and the specific impact of the coagulation with Polyaluminum Chloride on NPs removal. Using an original and novel combination of different analytical techniques (turbidity, ζ-potentials, size distribution measurements, electron microscopy, total organic carbon determination) we found that filtration processes through sand and GAC achieve an overall NPs removal of 96.3 % ± 1.0. NPs removal is mainly attributed to straining and adsorption processes during filtration. Then experiments were conducted in presence of PACl to quantify the impact of coagulation on the TiO2 NPs removal efficiency. It was found that the addition of coagulant significantly improves TiO2 NPs removal with a global removal efficiency greater than 99.5 % ± 0.5. The higher removal efficiency in presence of coagulant was related to a significant TiO2 NPs surface charge reduction and subsequent formation of aggregates increasing their retention and attachment in the filter media.
{"title":"Transport and retention of titanium dioxide nanoparticles in a drinking water treatment plant. Effects of coagulation, filtration and raw water properties on the removal efficiency","authors":"Lina Ramirez-Arenas , Robin Noyer , Stéphan Ramseier Gentile , Stéphane Zimmermann , Pauline Perdaems , Pascal Ramaciotti , Wei Liu , Serge Stoll","doi":"10.1016/j.colsuc.2025.100067","DOIUrl":"10.1016/j.colsuc.2025.100067","url":null,"abstract":"<div><div>Increasing the use and release of titanium dioxide nanoparticles (TiO<sub>2</sub> NPs) into aquatic systems, including water compartments used to produce drinking water, represent a risk for human health through direct NPs ingestion. Since drinking water treatment plants (DWTPs) must provide and guarantee the quality of the water for human consumption, in this study, TiO<sub>2</sub> NPs removal efficiency of a DWTP which provides drinking water for half million consumers is investigated. For that purpose, a pilot-scale designed to closely reproduce each treatment process of the main DWTP is considered. Experiments were first conducted without considering the coagulation process to evaluate the efficiency of the filtration processes (sand and granular activated carbon) and the specific impact of the coagulation with Polyaluminum Chloride on NPs removal. Using an original and novel combination of different analytical techniques (turbidity, ζ-potentials, size distribution measurements, electron microscopy, total organic carbon determination) we found that filtration processes through sand and GAC achieve an overall NPs removal of 96.3 % ± 1.0. NPs removal is mainly attributed to straining and adsorption processes during filtration. Then experiments were conducted in presence of PACl to quantify the impact of coagulation on the TiO<sub>2</sub> NPs removal efficiency. It was found that the addition of coagulant significantly improves TiO<sub>2</sub> NPs removal with a global removal efficiency greater than 99.5 % ± 0.5. The higher removal efficiency in presence of coagulant was related to a significant TiO<sub>2</sub> NPs surface charge reduction and subsequent formation of aggregates increasing their retention and attachment in the filter media.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100067"},"PeriodicalIF":0.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-25DOI: 10.1016/j.colsuc.2025.100066
Yudha Gusti Wibowo , Dedy Anwar , Hana Safitri , Aris Setiawan , Sudibyo Sudibyo , Ahmad Tawfiequrrahman Yuliansyah , Himawan Tri Bayu Murti Petrus
Chromium is a highly toxic heavy metal linked to severe chronic respiratory diseases, including asthma, rhinitis, pulmonary fibrosis, and chronic obstructive pulmonary disease. Despite extensive research on chromium removal techniques such as adsorption, phytoremediation, and constructed wetlands, each method has inherent limitations in efficiency, selectivity, and long-term applicability. This review introduces a novel hybrid absorption-adsorption approach utilizing magnetite-zeolite suspended in glycol slurry as a promising alternative for chromium remediation. This is the first comprehensive review to systematically analyze this method, highlighting the unique physicochemical properties of magnetite-zeolite and its adsorption mechanisms. Furthermore, the review critically evaluates recent advancements, challenges, and potential improvements in this technique while providing recommendations for future research and practical applications. The insights presented in this study are expected to drive further experimental investigations and contribute to the development of more effective and sustainable strategies for chromium removal from wastewater.
{"title":"Comprehensive Review of Hybrid Absorption-Adsorption Techniques for Chromium Removal from Wastewater Using Magnetite-Zeolite Suspended in Glycol Slurry","authors":"Yudha Gusti Wibowo , Dedy Anwar , Hana Safitri , Aris Setiawan , Sudibyo Sudibyo , Ahmad Tawfiequrrahman Yuliansyah , Himawan Tri Bayu Murti Petrus","doi":"10.1016/j.colsuc.2025.100066","DOIUrl":"10.1016/j.colsuc.2025.100066","url":null,"abstract":"<div><div>Chromium is a highly toxic heavy metal linked to severe chronic respiratory diseases, including asthma, rhinitis, pulmonary fibrosis, and chronic obstructive pulmonary disease. Despite extensive research on chromium removal techniques such as adsorption, phytoremediation, and constructed wetlands, each method has inherent limitations in efficiency, selectivity, and long-term applicability. This review introduces a novel hybrid absorption-adsorption approach utilizing magnetite-zeolite suspended in glycol slurry as a promising alternative for chromium remediation. This is the first comprehensive review to systematically analyze this method, highlighting the unique physicochemical properties of magnetite-zeolite and its adsorption mechanisms. Furthermore, the review critically evaluates recent advancements, challenges, and potential improvements in this technique while providing recommendations for future research and practical applications. The insights presented in this study are expected to drive further experimental investigations and contribute to the development of more effective and sustainable strategies for chromium removal from wastewater.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100066"},"PeriodicalIF":0.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Electrocoagulation (EC) method used for eliminating oil from oily wastewater, though it encounters challenges such as high operational costs and electrode passivation. The novelty of this research is its development of a cost-effective and highly efficient EC process, specifically optimized for sunflower oil wastewater. The effectiveness of EC in reducing turbidity was evaluated through experimental analysis. The Taguchi methodology was employed to optimize critical process parameters: pH, operating voltage, EC duration, electrode spacing, and sodium chloride concentration. The Optimal conditions identified were pH 6, 30 V, 80 minutes of EC duration, 5 cm electrode spacing, and 0.2 g/L NaCl, achieving an impressive oil removal rate of 94.46 %, along with high energy efficiency. Characterization of the electrodes using UV spectroscopy, SEM, and EDX under these optimal conditions further supported the findings. The study also examined the operating cost (OC) associated with the EC process using aluminium electrodes. Energy consumption ranged from 0.96 kWh/m³ to 22.61 kWh/m³ , while aluminium electrode consumption varied between 0.06 kgAl/m³ and 0.275 kgAl/m³ . The OC fluctuated from 0.252 to 4.654 USD per 1000 litres of oil wastewater treatment across nine orthogonal array experiments. This research contributes to advancing sustainable EC technology for separating emulsified oil-water mixtures, aligning with circular economy principles for responsible industrial wastewater management.
{"title":"Taguchi optimized electrocoagulation technology: A sustainable approach to oil-water separation in large scale applications","authors":"Hansa Muvel , Manoj Kumar Jindal , Pradip Kumar Tewari , Semyon Mareev , Vikky Anand","doi":"10.1016/j.colsuc.2025.100065","DOIUrl":"10.1016/j.colsuc.2025.100065","url":null,"abstract":"<div><div>Electrocoagulation (EC) method used for eliminating oil from oily wastewater, though it encounters challenges such as high operational costs and electrode passivation. The novelty of this research is its development of a cost-effective and highly efficient EC process, specifically optimized for sunflower oil wastewater. The effectiveness of EC in reducing turbidity was evaluated through experimental analysis. The Taguchi methodology was employed to optimize critical process parameters: pH, operating voltage, EC duration, electrode spacing, and sodium chloride concentration. The Optimal conditions identified were pH 6, 30 V, 80 minutes of EC duration, 5 cm electrode spacing, and 0.2 g/L NaCl, achieving an impressive oil removal rate of 94.46 %, along with high energy efficiency. Characterization of the electrodes using UV spectroscopy, SEM, and EDX under these optimal conditions further supported the findings. The study also examined the operating cost (OC) associated with the EC process using aluminium electrodes. Energy consumption ranged from 0.96 kWh/m³ to 22.61 kWh/m³ , while aluminium electrode consumption varied between 0.06 kgAl/m³ and 0.275 kgAl/m³ . The OC fluctuated from 0.252 to 4.654 USD per 1000 litres of oil wastewater treatment across nine orthogonal array experiments. This research contributes to advancing sustainable EC technology for separating emulsified oil-water mixtures, aligning with circular economy principles for responsible industrial wastewater management.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100065"},"PeriodicalIF":0.0,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-11DOI: 10.1016/j.colsuc.2025.100064
Nour Kashlan , Caitlyn Hsiung , Erica Pensini
Diisopropylamine (DIPA) is used in various industrial processes, such as the Sulfinol™ process to remove acidic components from oil and gas, and in the production of pesticides. It has relatively high solubility in water (≈100 g/L) and is found as a contaminant in groundwater. This study uses for the first time natural citric acid (CA) to purify water contaminated with DIPA with low energy costs. CA leads to the bulk separation of DIPA from concentrated aqueous mixtures, as demonstrated using attenuated total reflectance–Fourier transform infrared spectroscopy. Therefore, it offers a potential emergency response in the case of large spills. CA also enhances the volatilization of DIPA from aqueous solutions, as demonstrated using nuclear magnetic resonance. Therefore, it also offers a potential approach to facilitate stripping of DIPA from water in pump and treat, where groundwater is extracted, treated at the surface and reinjected. These findings suggest that CA can serve as a sustainable and effective tool to treat DIPA contamination.
{"title":"Citric acid facilitates diisopropylamine separation from water: A potential solution for groundwater remediation","authors":"Nour Kashlan , Caitlyn Hsiung , Erica Pensini","doi":"10.1016/j.colsuc.2025.100064","DOIUrl":"10.1016/j.colsuc.2025.100064","url":null,"abstract":"<div><div>Diisopropylamine (DIPA) is used in various industrial processes, such as the Sulfinol™ process to remove acidic components from oil and gas, and in the production of pesticides. It has relatively high solubility in water (≈100 g/L) and is found as a contaminant in groundwater. This study uses for the first time natural citric acid (CA) to purify water contaminated with DIPA with low energy costs. CA leads to the bulk separation of DIPA from concentrated aqueous mixtures, as demonstrated using attenuated total reflectance–Fourier transform infrared spectroscopy. Therefore, it offers a potential emergency response in the case of large spills. CA also enhances the volatilization of DIPA from aqueous solutions, as demonstrated using nuclear magnetic resonance. Therefore, it also offers a potential approach to facilitate stripping of DIPA from water in pump and treat, where groundwater is extracted, treated at the surface and reinjected. These findings suggest that CA can serve as a sustainable and effective tool to treat DIPA contamination.</div></div>","PeriodicalId":100290,"journal":{"name":"Colloids and Surfaces C: Environmental Aspects","volume":"3 ","pages":"Article 100064"},"PeriodicalIF":0.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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